Fireproof window.



n.- B|EnsAcH. FIREPBDOF WIvNDUW.

(Application am Aug. 1, 1901.)

- (lolodel.)

UNITED STATES PATENT OFFICE.

LOUIS D. BIERSAOH, OF MILWAUKEE, WISCONSIN. p

FIREPROOF WINDOW.

SPECIFICATION forming part of Letters Patent N o. 690,392, dated January7, 1902.

Application filed August l, 1901. Serial No. 70,443. (No model.)

' To all whom, t may concern:

Be itknown that I, Louis D. BIERSACH, a citizen of the United States,residing at Milwaukee, county of Milwaukee, and State of Wisconsin, haveinvented new and useful Improvements in Fireproof Vindows, of which thefollowing is a specification.

My invention relates to improvements in fireproof windows for buildings;and it pertains more especially, first, to the peculiar construction ofthe window-frame, by which the two opposing vertical lwalls may beremoved for the purpose of reaching the sashbalance weights and cords;second, to the construction of the flanges and grooves, by which thesash are held in place and guided when raised and lowered, and, third,to the means employed for forming a tight joint at the upper and loweredges of the sash.

The construction of my improvements is explained by referenceto theaccompanying drawings, in Which- Figure l represents a vertical sectionof the window sash and frame provided with my improvements. Fig. 2 is ahorizontal section drawn on line m c of Fig. l. Fig. 3 is a horizontalsection showing the manner of securing the panes of glass at the centerof the window-sash where morethan a single light of glass is used.

Like parts are identilied bythe same reference-letters throughouttheseveral views.

A represents the window-frame, one side only of which is shown. Therespective sides A consist of the vertical sheet-metal wall B, whichcomprises all that part of the frame between the vertical edges C C,including the two hollow angular columns D E and F, the hollow column Fserving as a space for the ordinary sash-weights G G.

H is a removable plate, which comprises all that part between thevertical edges I I. The plate H is formed with two inwardly-extendingrecesses or grooves J J for the reception of brass or othernon-corrosive guidingflanges K K, which anges K K are respectivelyformed of a single piece of sheet-brass, which is folded back centrallyupon itself from the outer edge L, whereby the outer edge L is caused topresent a smooth rounded surface in cross-section, as indicated in Fig.1, upon which the bearings of the sash N N are adapted to slide. Thegrooves M of the sash continuous piece with the galvanized iron,

sash and frame, and such parts as thus constructed are liable to rustand break, and are therefore n'ot durable, especially so owing to thefact that when galvanized iron is bent at such sharp angles as isnecessary in forming the beads and grooves the galvanized surface peelsoff and v the metal is soon destroyed by rust. f

P represents the lwindow-glass, which is held in place at its verticalsides by the angular flanges Q, bolts R, and nuts S. The nuts S may besoldered to the inner wall of the sash-frame, and thus supportedpreparatory to inserting the bolts in the flanges, when said bolts areturned down in said nuts, thereby holding said flanges Q in place. Theupper and lower edges of the pane of glass P are held in place in thesashbythe grooves T and U. The upper groove T isvof such height as willpermit the glass to be raised therein far enough to engage the loweredge in the lower groove U,`when said glass is permitted to drop in saidlower groove, where itis held in place, as indicated in Fig. l.

When desirous to form a close joint at the upper and lower edges of theWindow-sash, I provide the frame A above and below the respective sashwith U-shaped grooves A A for the reception of the fianges B B,which danges are formed of strips of sheet-brass, which are folded centrally overupon themselves, as indicated in Fig. l, where they are secured at theirrespective marginal edges in said grooves A' of the frame, while theirrounded or folded edges respectively extend into corresponding grooves OO', formed in the opposing edges of the respective upperand lower sash.

It is obvious that, if desired, the iianges B B may be permanentlysecured in the sash instead of the frame,when their projecting edges IOOwill be fitted into corresponding grooves formed in the window-frame.

When more than two panes of glass D are used, their opposing edges aresupported against the vertical metallic central piece E', Where theyparesecured in place by the U- shaped plate or bracket F and bolt G', asindicated in Fig. 3. The object of the bracket F is to cover up thejoint at Ithe edges of the glass and prevent the water from enteringtherein. The vertical edges of the windowsash are provided with groovesH' for the reeeption of the ordinary sash-balance cords orv gitudinalnon corrosive guide-bearings (U-k shaped in cross-section) for thereception of said guide-flanges, substantially as set forth.

2. In a reproof Window, the combination of ahollow, metallicwindow-frame; separate, non corrosive guide flanges, respectively formedof a single strip of brass folded longitudinally and centrally back uponitself, and secured to the opposing vertical sides of said window-frame;and Window-sash provided with longitudinal non-corrosive guidebear ings,formed of a single strip of brass bent U shape in cross-section, for thereception of said guide-Hanges, as set forth.

3. In a fireproof window, the combination of a hollow, metallicwindow-frame A vertical sides B,which comprise the several parts betweenthe vertical edges C, C, formed integral, all rigidly secured together;removable vertical plate II, comprising the parts between the verticaledges I, I, secured and interlocked together; separate metallicguide-anges K rigidly secured in said removable plate H of the opposingvertical side Walls of the Window-frame; and window-sash, the side railsot' which are provided with separate metallic guide-bearings O, forthereception 'of said guide-flanges, substantially asset forth.

4. In a reproof Window, the combination with the respective sides of thewindow-frame; of separate non-corrosive guide-flanges L, and with therespective side rails of the sash; of the non-corrosive guidebearings Oformed for the reception of said guide-anges, and with the top andbottom rails of the respective upper and lower sash, and the contiguousbear-A ing-surfaces of the Window-frame above and below said upper andlower rails; of the horizontal ianges B', rigidly affixed at their outer`edges in the opposing walls of said windowframeand adapted to engage incorresponding recesses formed in the opposing edges of the upper andlower rails of said sash, as set forth.

In testimony whereof I affix my signature in the presence of twoWitnesses. I

LOUIS D. BIERSACH. Witnesses:

J As. B. ERWIN, AUG. NIEDERMEYER.

